LG ARUN Series Service Manual page 107

Error
Error Type
No.
Over-Capacity
(Sum of indoor unit capaci-
51
ty is more than outdoor
capacity)
I Error diagnosis and countermeasure flow chart
Is capacity sum of
indoor units less than
130% of outdoor unit
capacity at LGMV?
Yes
Check following
dip S/W setting is on
Slave1: No.5,7
Slave2: No. 6,7
Slave3: No. 5,6,7
Yes
Is power of Slave PCB
On? (Check LED blinking)
Yes
Is communication
cables between outdoor units
connected correctly?*
Yes
Is error code released
in order(Slave2➠Slave1➠Main)
after power reset?
Yes
End
* In order to check communication
cables between outdoor units,
check in order as below
➠
: PCB connectors
➠
terminal block
communication cables
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Only for training and service purposes
Error Point
Sum of indoor unit capaci-
ty exceed outdoor unit
capacity specification
Are quantity and capacity
No
of indoor units installed
same as the data of LGMV?
Yes
Adjust the capacity of indoor
and outdoor unit
No
Adjust corresponding DIP switch
No
Is main power really supplied?
(Terminal Block T-N)
Yes
Check and replace PCB,
Line Fuse, Transformer
No
Re-connect
No
Replace Main or Slave PCB
- 107 -
Troubleshooting Guide
Main Reasons
1. 130% more than outdoor unit rated capacity
2. Wrong connection of communication
cable/piping
3. Control error of slave outdoor unit Dip switch
4. Power supply defect of slave unit PCB
5. Defect of outdoor unit PCB
Check communication cables
No
between indoor and outdoor
units
No Supply main
power again
LGE Internal Use Only